Receivables Prepayment amount > Invoice Amount, how does the balance go on-account?

We're leveraging Order Management / Receivables Prepayment functionality to apply prepayment up front when the order is booked. However, we have a case where prepayment amount > order amount (and eventually invoice amount). Can I do the following:

1. Balance left over be placed on-account and used against another invoice
2. Balance left over remains as prepayment amount, can this be used against another invoice.